Perhaps you should try some spelling variations:
thieu nien » thien nhien
hanh vinh » thanh vinh, khanh vinh, hanh tinh
vinh cuu » dinh cuu, sinh cua, dinh cu
thu sach » tu sach, thuat sach, thuoc sach
nien dai » nhien dai, hien dai, vien dai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
dai xu » dai tu, dao xu, hai xu
xu va » xu van, tu va, su va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien dai xu va hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien dai xu va hanh vinh cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky ((nang xa) OR (nang ma)) hoi. thieu nien dai xu va hanh vinh cuu tre*".